/Engine/Source/Runtime/MovieScene/Public/EntitySystem/MovieSceneSequenceInstance.h
A sequence instance represents a specific instance of a currently playing sequence, either as a top-level sequence in anIMovieScenePlayer, or as a sub sequence. Any given sequence asset may have any number of instances created for it at any given time depending on how many times it is referenced by playing sequences
struct FSequenceInstance
FEntityLedger
Ledger
Ledger that tracks all currently instantiated entities for this instance